Cataract after exposure to non-ionizing radiant energy

Br J Ophthalmol · 1976 · Harm · Very low evidence

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HarmVery low evidencePaper 6682

Study snapshot

PublicationBr J Ophthalmol · 1976

Study typecase_report

Reported directionHarm

Evidence ratingVery low

Abstract

The case histories of two individuals exposed to thermal radiation emitted from an electric oven and range were presented. In one patient, earlier exposure to medical diathermy appears to have initiated delayed or late-appearing, capsular cataracts. Instead of the anticipated slow progression, the cataractogenesis was accelerated following recent, repeated exposure to the intense, infrared radiation. In the other patient, exposed solely to infrared radiation, a chorioretinal lesion indistinguishable from the type characteristically secondary to repeated, thermal radiation was observed. More recently, the earliest sign of thermal radiation cataractogenesis, capsular opacification, has become evident. The widespread availability of radiant energy sources such as diathermy machines, microwave ovens, and electric ovens and ranges makes it imperative to examine carefully any possible hazards that may result from their use. With this in mind, radiant energy should be considered in the differential diagnosis of cataractogenesis.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typecase_report

Effect directionharm

PopulationTwo individuals (patients)

Sample size2

ExposureNot supplied

Evidence strengthVery lowConfidence: 74% · Peer reviewed: yes

Main findings

Two case histories are described involving exposure to thermal/infrared radiation from an electric oven and range. In one patient, earlier exposure to medical diathermy appeared to initiate delayed capsular cataracts, with accelerated cataractogenesis after recent repeated intense infrared exposure. In the other patient, exposed solely to infrared radiation, a chorioretinal lesion consistent with repeated thermal radiation was observed and later capsular opacification became evident.

Outcomes measured

capsular cataracts
accelerated cataractogenesis after repeated intense infrared exposure
chorioretinal lesion
capsular opacification (early sign of thermal radiation cataractogenesis)

Limitations

Case reports with only two individuals
Exposure levels/dose not quantified (no frequency, intensity, or duration provided)
Causality cannot be established from case histories alone
Potential confounding factors not described in the abstract

View raw extracted JSON

{
  "study_type": "case_report",
  "exposure": {
    "band": null,
    "source": "electric oven and range; medical diathermy; infrared (thermal) radiation",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Two individuals (patients)",
  "sample_size": 2,
  "outcomes": [
    "capsular cataracts",
    "accelerated cataractogenesis after repeated intense infrared exposure",
    "chorioretinal lesion",
    "capsular opacification (early sign of thermal radiation cataractogenesis)"
  ],
  "main_findings": "Two case histories are described involving exposure to thermal/infrared radiation from an electric oven and range. In one patient, earlier exposure to medical diathermy appeared to initiate delayed capsular cataracts, with accelerated cataractogenesis after recent repeated intense infrared exposure. In the other patient, exposed solely to infrared radiation, a chorioretinal lesion consistent with repeated thermal radiation was observed and later capsular opacification became evident.",
  "effect_direction": "harm",
  "limitations": [
    "Case reports with only two individuals",
    "Exposure levels/dose not quantified (no frequency, intensity, or duration provided)",
    "Causality cannot be established from case histories alone",
    "Potential confounding factors not described in the abstract"
  ],
  "evidence_strength": "very_low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "cataract",
    "capsular cataract",
    "infrared radiation",
    "thermal radiation",
    "diathermy",
    "electric oven",
    "range",
    "chorioretinal lesion",
    "non-ionizing radiation"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.35,
      "reason": "Exposure described from radiant energy sources (diathermy; ovens/ranges) with potential relevance to workplace or repeated-use settings."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1136/bjo.60.9.632
PubMed: 990233

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